Improvement in lifting-jacks



- S. LESHER.

Lifting-Jack.

No. 202,354. Patenfed April 16, I878.

/liieai/ Imwztw UNITED STATES PATENT OEEIoE.

SAMUEL LESHER, OF SHARON, PENNSYLVANIA, ASSIGNOB OF ONE-HALF HIS RIGHTTO J. M. WILLSON, OF SAME PLACE.

IMPROVEMENT IN LlFTlNG-JACKS.

Specification forming part of Letters Patent No. 202,354, dated April16, 1878; application filed August 30, 1877.

To all whom it may concern:

Be it known that I, SAMUEL LESHER, of Sharon, in the county of Mercerand State of Pennsylvania, have invented certain new and usefulImprovements in Wagon and Carriage Lifting-Jack's; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to that class of liftingjacks which are operatedby a lever and eccentrio; and it consists in the construction,combination, and arrangement of the devices hereinafter set forth andclaimed.

Figure 1 represents a side elevation of my improv' l lifting-j ack. Fig.2 represents a vertical ction of the same through lines ax of Fig. 1. Ip

In the accompanying drawings, A designates the bed-piece of mylifting-jack, which supports a vertical frame, B, consisting of sidepieces 12 b and closing-strips b b 12 which partly inclose the spacewithin said frame. The two upper strips 11 b form, with side pieces I)b, a complete box or casing, B, at the upper end of said frame. Theother strip, b extends upward from bed-piece A on the same side of saidframe with strip b Said frame B is left sufficiently open to allow ofthe play of an operating-lever and eccentric, hereinafter described. 0designates said lever, which is upwardly curved, as shown, and pivotedin frame B between side pieces I) I), close to the edge of said frame.The end of said lever within said frame is expanded, so as to form aneccentric,.O, which operates against a slide or lifting bar, D, thatworks up and down in casing B. This lifting-bar is provided at one ofits upper corners with the usual notch or right-angled recess d, and atone of the bottom corners with a lug, d, which extends horizontallyoutward above lever O. This lug constitutes an extension of the bottomof said lifting-bar D, so that the latter may receive the full force ofeccentric G, which would otherwise wear againstthe corner of said lifting-bar, and transmit a diagonal strain thereto during the latter part ofits rotation. Closingstrip 1) is rectan gularly recessed at the bottom,at b, to receive said lug d when the slide or lifting bar is in itshighest position. This recess allows the said lifting-bar to havesufficient upward motion; but strip b prevents said lug d from passingupward beyond said recess, and thus obviates all possibility of saidliftingbar accidentally separating from frame B. Said frame is providedwith two or more perforations, b b, for the pivot-bolt I) of lever 0, sothat said lever. may be pivoted at a higher or lower point, for thepurpose of regulatin g the action of eccentric O on liftingbar D.

The curved shape of said lever 0 allows a firmer grasp to be maintainedupon it as it descends in an arc, and also enables pressure to beapplied to greater advantage when it is near its lowest position.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The combination of curved leverO, eccentric 0, frame B, having strip band rectangular recess b in its under side, and lifting-bar D, providedwith lug d, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

SAMUEL LESHER.

Witnesses:

FRANK DAVIS, .HENRY PUTT.

